145 lines
4.3 KiB
SQL
145 lines
4.3 KiB
SQL
-- Suspicious URL requests by built-in fetching tools (event-based)
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--
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-- refs:
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-- * https://attack.mitre.org/techniques/T1105/ (Ingress Tool Transfer)
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-- * https://attack.mitre.org/techniques/T1571/ (Non-Standard Port)
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--
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-- interval: 60
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-- tags: transient process events
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-- platform: posix
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SELECT
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pe.pid,
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pe.cmdline,
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REGEX_MATCH (pe.cmdline, '(\w+:\/\/.*)\b', 1) AS url,
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REGEX_MATCH (pe.cmdline, '[ /](\d+\.\d+\.\d+\.\d+)[:/]', 1) AS ip,
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REGEX_MATCH (pe.cmdline, ':(\d+)', 1) AS port,
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REGEX_MATCH (pe.cmdline, '//([\w\-\.]+)[:/]', 1) AS addr,
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REGEX_MATCH (pe.cmdline, '//[\w\-\.]+\.(\w+)[:/]', 1) AS tld,
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pe.cwd,
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pe.euid,
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pe.parent,
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pp.parent AS gparent,
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p.cgroup_path,
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pp.path AS parent_path,
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pp.name AS parent_name,
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pp.cmdline AS parent_cmdline,
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gp.cmdline AS gparent_cmdline,
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gp.name AS gparent_name,
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pp.euid AS parent_euid,
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hash.sha256 AS parent_sha256
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FROM
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process_events pe
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LEFT JOIN processes p ON pe.pid = p.pid
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LEFT JOIN processes pp ON pe.parent = pp.pid
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LEFT JOIN processes gp ON pp.parent = gp.pid
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LEFT JOIN hash ON pp.path = hash.path
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WHERE
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pe.time > (strftime('%s', 'now') -60)
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-- NOTE: Sync remaining portion with sketchy-fetchers
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AND (
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INSTR(pe.cmdline, 'wget ') > 0
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OR INSTR(pe.cmdline, 'curl ') > 0
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)
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AND (
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-- If it's an IP or port, it's suspicious
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ip NOT IN ('', '127.0.0.1', '0.0.0.0', '::1')
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OR port != ''
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OR tld NOT IN (
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'',
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'app',
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'ca',
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'cloud',
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'com',
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'de',
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'dev',
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'edu',
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'fun',
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'gov',
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'io',
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'md',
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'mil',
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'net',
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'org',
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'se',
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'sh',
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'so',
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'uk'
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)
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-- Or if it matches weird keywords we've seen
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OR pe.cmdline LIKE '%.onion%'
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OR pe.cmdline LIKE '%tor2web%'
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OR pe.cmdline LIKE '%aliyun%'
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OR pe.cmdline LIKE '%pastebin%'
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OR pe.cmdline LIKE '%curl.*—write-out%'
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OR pe.cmdline LIKE '%curl %--user-agent%'
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OR pe.cmdline LIKE '%curl -k%'
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OR pe.cmdline LIKE '%curl -sL %'
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OR pe.cmdline LIKE '%curl%-o-%'
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OR pe.cmdline LIKE '%curl%--connect-timeout%'
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OR pe.cmdline LIKE '%curl%--output /dev/null%'
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OR pe.cmdline LIKE '%curl%--O /dev/null%'
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OR pe.cmdline LIKE '%curl%--insecure%'
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OR pe.cmdline LIKE '%wget %--user-agent%'
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OR pe.cmdline LIKE '%wget %--no-check-certificate%'
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OR pe.cmdline LIKE '%wget -nc%'
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OR pe.cmdline LIKE '%wget -q%'
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OR pe.cmdline LIKE '%wget -t%'
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-- Or anything launched by a system user
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OR (
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pe.cmdline LIKE '%wget -%'
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AND pe.euid < 500
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AND p.cgroup_path NOT LIKE '/system.slice/docker-%'
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)
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OR (
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pe.cmdline LIKE '%curl %'
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AND pe.euid < 500
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AND pe.cmdline NOT LIKE "%./configure %--with-curl%"
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AND p.cgroup_path NOT LIKE '/system.slice/docker-%'
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)
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)
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-- Exceptions for all calls
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AND pp.name NOT IN ('makepkg', 'apko') -- Exceptions for non-privileged calls
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AND NOT (
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pe.euid > 500
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AND (
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pe.cmdline LIKE '%--dump-header%'
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OR pe.cmdline LIKE '%127.0.0.1:%'
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OR pe.cmdline LIKE '%/192.168.%:%'
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OR pe.cmdline LIKE '%/api/v%'
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OR pe.cmdline LIKE '%application/json%'
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OR pe.cmdline LIKE '%/chainctl_%'
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OR pe.cmdline LIKE '%ctlog%'
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OR pe.cmdline LIKE '%curl -X %'
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OR pe.cmdline LIKE 'git %'
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OR pe.cmdline LIKE '%go mod %'
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OR pe.cmdline LIKE '%grpcurl%'
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OR pe.cmdline LIKE '%Homebrew%'
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OR pe.cmdline LIKE '%https://api.github.com/%'
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OR pe.cmdline LIKE '%If-None-Match%'
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OR pe.cmdline LIKE "%libcurl%"
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OR pe.cmdline LIKE '%LICENSES/vendor/%'
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OR pe.cmdline LIKE '%localhost:%'
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OR pe.cmdline LIKE '%/openid/v1/jwks%'
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OR pe.cmdline LIKE '%--progress-bar%'
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OR pe.cmdline LIKE '%.well-known/openid-configuration%'
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OR pe.cmdline LIKE 'wget --no-check-certificate https://github.com/%'
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OR pe.cmdline LIKE 'curl -sL wttr.in%'
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OR parent_cmdline LIKE '%brew.rb%'
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OR parent_cmdline LIKE '%brew.sh%'
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)
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)
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-- These are typically curl -k calls
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-- We need the addr "IS NOT NULL" to avoid filtering out
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-- NULL entries
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AND NOT (
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addr IS NOT NULL
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AND (
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addr IN ('releases.hashicorp.com', 'github.com', 'dl.enforce.dev')
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-- Ignore local addresses (Docker development)
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OR addr NOT LIKE '%.%'
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OR ip LIKE '172.2%'
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OR ip LIKE '192.168.%'
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)
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)
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